Bacterial infection of the stomach lining (Helicobacter pylori infection) in dogs
- Synonyms: Helicobacter infection, Helicobacter gastritis,
- Occurrence: common
- Location of disease: Abdomen/pelvis
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
You can find an interesting overview of gastrointestinal problems in dogs, supplemented with information on the intestinal microbiome and the importance of probiotics, here: https://petsvetcheck.de/fachbeitrag/magen-darm-probleme-beim-hund/
Definition
A Helicobacter pylori infection in dogs is a bacterial infection of the stomach caused by the bacterium Helicobacter pylori. This infection can lead to inflammatory conditions in the stomach and impair digestion.
The most important facts at a glance
Helicobacter pylori is a bacterium that can infect dogs and often survives in acidic environments. This infection is less researched in dogs than in humans, where it is associated with gastritis and stomach ulcers. In dogs, transmission routes are still unclear, but contaminated food, water, or contact with infected animals could play a role. A weakened immune system, stress, and an unbalanced diet increase the risk of infection. Symptoms include vomiting, loss of appetite, abdominal pain, and diarrhea. Diagnosis often requires gastric biopsies, breath tests, or PCR tests.
Treatment is usually carried out with antibiotics and medications to lower stomach acid, often in the form of triple therapy with two antibiotics and a proton pump inhibitor. Therapy usually lasts 10 to 14 days. Good hygiene, a balanced diet, and regular veterinary examinations contribute to prevention. Current research focuses on pathogenesis in dogs, genetic analysis of bacterial strains, and the development of better diagnostic tests. New treatment methods such as probiotics and new antibiotics are also being investigated. This research could also provide insights for medical research in humans.
Causes
Helicobacter pylori is a gram-negative, microaerophilic bacterium that can colonize the stomachs of dogs. It is known for its ability to survive the acidic environment of the stomach, which gives it a survival advantage over many other microorganisms. The bacterium’s ability to embed itself in the gastric mucosa contributes to its pathogenesis.
H. pylori infection is less well-studied in dogs than in humans, where it is frequently associated with the development of gastritis, stomach ulcers, and even stomach cancer. In dogs, the exact transmission route of the bacterium is still unclear, but it is assumed that transmission can occur through contaminated food or water as well as through direct contact with infected animals.
The causes of an infection can be varied and include both environmental factors and the dog’s general state of health. A weakened immune system, stress, and an unbalanced diet can increase susceptibility to an infection.
Symptoms
Symptoms of a Helicobacter pylori infection in dogs can be subtle and non-specific, making diagnosis difficult. The most common symptoms include vomiting, decreased appetite, weight loss, diarrhea, and abdominal pain. Some dogs may also show signs of flatulence and discomfort.
In more severe cases or with persistent infection, chronic gastritis can occur, which can significantly affect the dog’s well-being. It is important to note that not all infected dogs show symptoms, which makes identifying and treating the infection difficult without a targeted diagnosis.
Therapy
Treatment of a Helicobacter pylori infection in dogs usually consists of a combination of antibiotics and medications to reduce stomach acid production. A commonly used therapy is the so-called triple therapy, which consists of two antibiotics (e.g., amoxicillin and clarithromycin) and a proton pump inhibitor (e.g., omeprazole).
The duration of treatment is usually 10 to 14 days, but the exact duration can vary depending on the severity of the infection and the dog’s response to the therapy. It is important to complete the full course of antibiotics to ensure complete eradication of the bacterium and to prevent the development of resistant bacterial strains.
In addition to drug treatment, supportive therapy with a special diet can help protect the stomach lining and promote healing. Regular follow-up examinations are important to monitor the success of the treatment and to detect possible relapses early.
Prognosis and follow-up care
The prognosis for dogs with a Helicobacter pylori infection is generally good, especially if the infection is detected and treated early. Most dogs respond well to therapy and show a significant improvement in symptoms after completing treatment.
In some cases, however, relapses can occur, especially if the therapy was not fully completed or if the dog continues to be exposed to risk factors. Regular monitoring and, if necessary, renewed therapy may be required to prevent re-infection.
Prevention
Prevention of Helicobacter pylori infections in dogs focuses on general hygiene measures and reducing the likelihood of transmission. This includes providing clean, fresh water and high-quality food, as well as avoiding contact with potentially infected animals.
A regular veterinary examination can help detect early signs of an infection and treat it in good time. It is also important to minimize stress for the dog and support a healthy immune system through a balanced diet and regular exercise.
Although there is currently no vaccine against Helicobacter pylori in dogs, future research in this area could offer new prevention strategies. Until then, maintaining good general health and hygiene remains the best approach for prevention.
Outlook on current research
Helicobacter pylori infection in dogs is gaining increasing importance in veterinary research. While Helicobacter pylori is well-studied in humans and primarily associated with stomach ulcers and gastritis, the understanding of this infection in dogs is still developing. Researchers are focusing on understanding the pathogenesis of the infection in dogs to better determine how the bacterium behaves in the animals’ gastrointestinal tract and what specific health problems it can cause.
Another area of current research is dedicated to the genetic analysis of Helicobacter strains detected in dogs. It is being investigated whether these strains exhibit unique properties that distinguish them from human variants. This could mean that dogs might show different symptoms or disease progressions than humans. Such findings could help develop more targeted treatment methods.
Additionally, researchers are interested in better understanding the transmission routes of the bacterium between dogs and between dogs and humans. Although there are indications that zoonotic transmission is possible, the exact mechanisms are still unclear. Studies focusing on environmental factors and the living conditions of dogs could offer new insights into infection prevention.
Another research focus is the development and improvement of diagnostic tests that enable early and precise detection of the infection in dogs. Traditional methods such as endoscopy are invasive and often require sedation. Therefore, work is being done on non-invasive tests such as breath or stool tests, which could represent a more comfortable alternative.
Regarding treatment, new antibiotic regimens and probiotics are being investigated to increase the effectiveness of the therapy while minimizing side effects. Since antibiotic resistance is also emerging as a problem in animal patients, this area of research is of crucial importance.
Finally, it should be mentioned that research into Helicobacter pylori infection in dogs could also allow conclusions for human medicine, particularly with regard to the development of vaccines and the study of host-microbe interactions.
Frequently Asked Questions (FAQs)
1. What causes a Helicobacter pylori infection in dogs?
2. What symptoms does a dog show with a Helicobacter pylori infection?
3. How is a Helicobacter pylori infection diagnosed in dogs?
4. Can humans be infected by infected dogs?
5. How is a Helicobacter pylori infection treated in dogs?
6. Can the disease become chronic in dogs?
7. Is there a prevention against Helicobacter pylori infections in dogs?
8. Does diet influence the risk of infection?
9. Are certain dog breeds more susceptible to Helicobacter pylori infections?
10. What is the prognosis for dogs with a Helicobacter pylori infection?
Literature
- Strauss-Ayali, D., & Simpson, K. W. (1999). Gastric Helicobacter infection in dogs. Veterinary Clinics of North America: Small Animal Practice, 29(2), 397–414. https://doi.org/10.1016/S0195-5616(99)50028-4
- Neiger, R., & Simpson, K. W. (2000). Helicobacter infection in dogs and cats: Facts and fiction. Journal of Veterinary Internal Medicine, 14(2), 125–133. https://doi.org/10.1111/j.1939-1676.2000.tb02221.x
- Taillieu, E., Chiers, K., Amorim, I., Gärtner, F., Maes, D., Van Steenkiste, C., & Haesebrouck, F. (2022). Gastric Helicobacter species associated with dogs, cats and pigs: Significance for public and animal health. Veterinary Research, 53, Article 42. https://doi.org/10.1186/s13567-022-01059-4
- Husnik, R., Klimeš, J., Kovaříková, S., & Kolorz, M. (2022). Helicobacter species and their association with gastric pathology in a cohort of dogs with chronic gastrointestinal signs. Animals, 12(10), Article 1254. https://doi.org/10.3390/ani12101254
- Prachasilpchai, W., Nuanualsuwan, S., Chatsuwan, T., Techangamsuwan, S., Wangnaitham, S., & Sailasuta, A. (2007). Diagnosis of Helicobacter spp. infection in canine stomach. Journal of Veterinary Science, 8(2), 139–145. https://doi.org/10.4142/jvs.2007.8.2.139
- Kubota-Aizawa, S., Ohno, K., Fukushima, K., Kanemoto, H., Nakashima, K., Uchida, K., Chambers, J. K., Goto-Koshino, Y., Watanabe, T., Sekizaki, T., Mimuro, H., & Tsujimoto, H. (2017). Epidemiological study of gastric Helicobacter spp. in dogs with gastrointestinal disease in Japan and diversity of Helicobacter heilmannii sensu stricto. The Veterinary Journal, 225, 56–62. https://doi.org/10.1016/j.tvjl.2017.05.004
- Amorim, I., Smet, A., Alves, O., Teixeira, S., Saraiva, A. L., Taulescu, M., Reis, C. A., Haesebrouck, F., & Gärtner, F. (2015). Presence and significance of Helicobacter spp. in the gastric mucosa of Portuguese dogs. Gut Pathogens, 7, Article 12. https://doi.org/10.1186/s13099-015-0061-0
- Rimbara, E., Aoki, S., Suzuki, M., Kobayashi, H., Nakagawa, T., Goto-Koshino, Y., Nomura, S., Du, W.-Y., Matsui, H., Mori, S., Shibayama, K., Kenri, T., & Ohno, K. (2025). Characterization of three novel Helicobacter species infecting stomachs of dogs and cats: Helicobacter gastrocanis sp. nov., Helicobacter gastrofelis sp. nov., and Helicobacter felistomachi sp. nov. Frontiers in Microbiology, 15, Article 1459401. https://doi.org/10.3389/fmicb.2024.1459401